Asp.net C # obtain the last day of the previous month of the current month.

Original http://blog.csdn.net/summer_dream_journey/article/details/8998338

The project is used, so it is fully written for reference.

 

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1. DateTime dt = DateTime. Now;
2. Int weeknow = Convert. ToInt32 (DateTime. Now. DayOfWeek );
3. Int dayspan = (-1) * weeknow + 1;
4. DateTime dt2 = dt. AddMonths (1 );
5. // Obtain the first day of the week
6. This. Label1.Text = DateTime. Now. AddDays (dayspan). ToString ("yyyy-MM-dd ");
7. // The first day of the month
8. This. Label1.Text = dt. AddDays (-(dt. Day) + 1). ToString ("yyyy-MM-dd ");
9. // Last day of the month
10. This. Label1.Text = dt2.AddDays (-dt. Day). ToString ("yyyy-MM-dd ");
11. // The first day of last month
12. This. Label1.Text = dt. AddMonths (-1). AddDays (-dt. Day + 1). ToString ("yyyy-MM-dd ");
13. // Last day of last month
14. This. Label1.Text = dt. AddDays (-dt. Day). ToString ("yyyy-MM-dd ");
15. // The first day of the previous year
16. This. label1.Text = dt. addYears (-1 ). addMonths (-dt. month + 1 ). addDays (-dt. day + 1 ). toString ("yyyy-MM-dd ");
17. // Last day of the previous year
18. This. Label1.Text = dt. AddMonths (-dt. Month + 1). AddDays (-dt. Day). ToString ("yyyy-MM-dd ");
19. // The first day of this year
20. This. Label1.Text = dt. AddMonths (-dt. Month + 1). AddDays (-dt. Day + 1). ToString ("yyyy-MM-dd ");
21. // The first day of last week
22. This. Label1.Text = DateTime. Now. AddDays (daydiff-7). ToString ("yyyy-MM-dd ");
23. // Last day of last week
24. This. Label1.Text = DateTime. Now. AddDays (daydiff-1). ToString ("yyyy-MM-dd ");